Highly tunable acoustic metamaterials based on a resonant tubular array

This is the authors' abstract. We don't add key points for this paper.

Recent theoretical studies demonstrated that waves can be steered in any desired fashion by using a suitable distribution of material parameters. However, the required parameters for acoustic transformations often surpass the ranges available from the metamaterials developed so far. We introduce a class of acoustic metamaterials based on standing waves in a tubular array and experimentally demonstrate continuous tuning of the compressibility in an unprecedentedly wide range from -8 to 6 relative to air at audio frequencies. Potential applications include the acoustic Luneburg lens and cloaking.